Hoisting-engine.



S. T NELSON.

HOISTING ENGINE.

APPLICATION FILED MAY 9, 1905.

Patented Oct. 13,1908.

5 SHEBTSSHEET 1.

S. T. NELSON.

' HOISTING ENGINE. APPLIUATION FILED MAY 9, 190B.

Patented Oct. 13, 1908.

5 SHEETS-SHEET 2.

s. T. NELSON.

HOISTING ENGINE.

APPLICATION FILED MAY 9, 1906.

' Patented 0013. 13, 1908. 5 SHEETS-SHEET a.

S. T. NELSON.

Patented Oct. 13, 1908.

6 SHEETS-SHEET 4.

S. T. NELSON. EOISTING ENGINE.

u rmoumn mm: In 9, 1906.

Patented 45 inc.-

A UNITED s'rArnsrArENT curios.

SVEN T. NELSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO SULLIVAN MACHINERY COMPANY,

' I OF CHICAGO, ILLINOIS, A CORPORATION.

HOISTING-ENGINE.

' Specification of Letters Patent.

Patented Oct. 13, 1908.

Application filed mat e, 1906,. Serial No. 315,955.

To all whom it may concern: I

Be it known that I, SVENT. NELSON, a

Improvements in Hoisting-Enginesof which the following is declared to be a full, clear, and exact description.

The invention relates to hoisting engines for operating the cages or skips in mines its upward travel in the mine shaft.

A further object of the invention is to providejmeans whereby the operation of the engine reverse ear and the clutch mechanism for coupling the hoist ng drums to the engine shaft, will release or restore the automatic throttlin mechanism.

With t lose and other objects in view the invention consists in the features of construction, combinations and arrangements of parts hereinafter set forth, illustrated in the accompanying i'lrawings and more particularly pointed out'in the appended claims.

. The invention is more particularly applicable to a double drum hoist, in which two drums are mounted on the engine shaft, the

cables being wound thereon in opposite directions so that the two cars or cages may be hoisted in balance if desired. Suitable I clutch mechanism, as usual, is provided for --connect1ng either or both drums to the engine shaft and suitable reverse gear is provided for the engine. connection with each drum for automatically throttling the engine at a predetermined point or when the car approaches the upper end of the mine shaft.- The clutch and reverse operating gear is connected to disengage the automatic throttling mechanism so as to permit the further operation ofthe en- As usual with such double drum oists, both drums are mounted upon a common engine shaft and there are two engines, one coupled to each end of the shaft. v

In the drawings, Figure 1 is a partial plan view of the double drum hoist with the improved controlling mechanisms applied thereto. Fig. 2 is an elevation of one of'th'e engines with parts shown in section on the line 2-2 of Fig. 1. Fig. 3 is a View in elevation of the automatic throttling mechanism automatic throttling mechanism.

wrist-plate 16. Means are provided in with parts shown in section on the lines 33 of Figs. 1 and 4. Fig. 4 is'a plan view of the p t Fig. 5 is a detail view in elevation of a portion of the automatic throttling mechanism with parts shown in section on the line 5-5 of Fig. 4.

Fig. 6 is a detail section on the line 6-6 of Fig. 4. Fig.7 is a view in elevation of the reverse and clutchoperating mechanisms with parts broken away and parts in section on the line 7-7 of Fig. 1. Fig. 8 is a detail View of the reverse mechanism with parts shown in section on the line of Fig. 1. Fig. 9 is an elevation of the clutch mecl'ianism with parts in section on line 99 of Fig. 1.

In the form shown, the drums mounted upon a common engine shaft a. As stated, the cables .for the two cars or cages are wound in o posite directions about the drums so that they will be hoisted in A, A are balance when both drums are coupled to the shaft; that is to say, one car will be' stated, there is an engine at each end of the shaft a, only one of which is shown. It willbe understood that the other engine is of similar construction. The shaft a is provided at each end with a crank 13 coupled by a connecting rod 14 to the adjacent engine. The engine cylinders 15, as shown, are provided (see Figs. 1 and 2) with the ordinary Corliss valve gear driven from a The latter are driven by connecting rods 17 coupled at their forward ends to crank pins 18 on the ends of the valve shaft 6. This shaft extends from side to side in front of the drums A, A and is journaled at either end in suitable bearings .19 on the engine frames 12 and in intermediate bearings 20, 21 and arranged on suitable standards rising from the foundation' of the engine.

At one end (see Figs. 1, 7 and 8) valve shaft 6 is provided with a gear 23 that is the arm 27 away from one of the stops or lugs 26 into engagement with the other stop or lug the valve gear is properly positioned to reverse the-engine. Any suitable means may be provided for shifting the valve shaft. in the form shown, gear 23 is connectedto the end of a sleeve 28 loosely mounted on the shaft. At its opposite end thesleeve 28 :is provided with a half-portion 29 of a quick threaded screw. The other half ortion 30 of the screw is fixed to the valve s aft 1). A split nut 31 engages the screw sections 29 and 30. and by shifting the nut the valve shaft b may be rotated to reverse the engine.

A small auxiliary engine B is preferably provided for shifting the reversing nut 31. This engine is mounted in a suitable frame 32 fixed upon a bed plate 33 and supporting at its up er end the. earing 22 for t -e valve shaft. X split ring 34 arranged between a pair of flanges 35 on the nut 31 is provided with pintles 36 engaging the upper ends of a pair of arms 37. These arms are pivoted intermediate their ends to the engine frame by a cross bolt 38. The lower ends of the arms are connectedby links 39 to a cross head 40 on the piston rod 41 of the reversing engine B. The valve stem 42 of the reverse engine is provided with a crank arm 43 that is connected by a link 44 to a rocker arm 45. The rocker arm 45 is connected by a link 46 to an arm 47 (see Fig. 1) on arock shaft 48. This rock shaft is journaled at its forward end in a bearing 49 and extends rearwardly beneath the engineers platform C. As shown in Fig. 4, shaft 48 1s j ournaled ina bearing 50 on one side of a supporting standard 51 for the platform 0. A crank arm 52 on the rear end ofthe shaft is connected by a link 53 to a hand lever 54 on the engineers platform.

By the connections described the valve of the reverse engine may be shifted by the engineer to. change the direction of the movement of the engine shaft.

Each of the drums is arranged to be coupled to the engine shaft a by a suitable clutch mechanism shown in detail in Figs? and 9. A clutch band D is arranged to engage a projecting flange d on the outer end of the drum. One end of the band is secured to a projecting lug 55 that is rigidly mounted upon a head E keyed to the shaft. The opposite end of the clutch band is connecte to the rojecting end of a shift lever e that is pivotafly mounted on a stud shaft 56 carried atthe outer head or member E.

ortion of the clutch grooved collar 57 is v mounted to slide upon the hub of the clutch head or member E and to rotate therewith. A toggle link 58 ivoted betweena pair of lugs 59 on the col ar 57,'is connected to the, inner end of the band operating lever 6. By shifting the collar 57 longitudinally upon the hub of the clutch member E, clutch bandd 'are loosely mounted on the shaft 108.

arm on the end of the rock shaft 62 extends through a slotted cross head 66 on the piston rod 67 of the clutch engine. -The end of the arm 65 is slotted and a block 68 within the slot is mounted upon a cross pin 69 that is fixed to the cross head 66. The valve stem f of the clutch engine F is provided with a rock arm 70 connected by a link 81 to a rock arm 82 on the short shaft 83 journaled in a bracket 84. A rock arm 85 on the o posite end of the shaft is connected by a lin l 86 (see Figs. 1 and 2) to a crank arm 87 on a cross shaft 88 that is journaled in suitable bearings 89 on the bed late 33 beneath the engineers platform. Tiiere are two.of these shafts one for each clutch engine and each shaft is provided at its inner end with a rock arm 90 connected by a link 91 to a shift lever 92 (see Fig. 1) on the engineers platform C. By shifting the hand levers 92 the clutch engines F may be operated to couple and uncouple the drums A A on the engine shaft.

A throttle operating shaft g extends transversely between the engines and is j ournaled at its ends (see Figs. 1 and 2) in brackets 93. Intermediate its ends this shaft is journaled in bearings 94 upon the bed plate 33. I At each end (see Fig. 2) shaft 9 is provided with a crank arm 95 connected by a link 97 to an arm 98 on a short shaft 99 journaled on the upper ortion of the adjacent engine frame 12. S aft 99 is provided with an arm 100 connected by a link 101 to one arm of a bell crank 102, the other arm of which is connected to a stem 103 of the throttle valve G on the engine cylinder. Bell crank 102 is carried upon a pair of swinging links 104 (see Figs. 1 and 2) that are pivotallly mounted on the casing of the thrott e valve. Throttle shaft g is provided adjacent the brackets 94 (see Figs. 1, 3 and 4) with two crank arms 105 connected by links 106 to crank arms 107 keyed to a shaft 108 journaled in suitable bearings on the under side of the en ineers platform 0. A hand lever 109 (see igs. -1 and 3) is also keyed to the shaft 108. The other hand levers 54 and 122 y shifting the hand lever 109 the engineer may open and close the throttle valves of both en ines.

- uitable mechanism is provided that is controlled by the movement of the drums .face with a short rack A A for automatically closing the throttles.

collar 1.11 is mounted to slide upon the reduced end of the sleeve h but is normally held against a flange 112 on the end of the sleeve by a spring 113 extending between the collar and a shoulder 114 on the sleeve. The springs 113 yieldingly hold the shifter arms in, their outermost position. The throttle shaft 9 and the sleeve h thereon are arranged just beneath the reverse controlling shaft 48. Sleeve h is longitudinally shiftable on the throttle shaft g and is provided on its upper i which meshes W'lth a spur gear l on the reverse controlling shaft.

ends in the standan The gear I is arranged adjacent a bracket 1' in which the reverse shaft 48 is journaled at this point. It is obvious that by this arran ement sleeve h and shifters H are moved bac and forth upon the throttle shaft as the en ine is reversed.

uitable actuators are rovided for the shifters II in the form of dis 4 cams J. These actuating ram members are mounted on suitable uprights or standards 115 beneath the engineers platform. In the upper end of each standard (see Fig. 6) is journaled a sleeve 116 which is held against longitudinal movement through thestandard by a worm wheel 117 on one end and a collar 118 on its opposite end. Through each sleeve extends a iollow shaft 7' upon the outer ends of which I the actuating cam members J are keyed. The hollow shaft 9' is keyed to the sleeve 116 to rotate therewith, but is longitudinally movable through the sleeve. This 1011 itudinal movement of the hollow shaft an actuating cam member J is effected by a screw K threaded into the inner end'of the hollow shaft and rigidly mounted upon a bracket k secured to the standard 115. A pair of. actuating shafts M are {'ourn'aled at their rear s 115 and at their forward ends in suitable brackets 119 (see Fig.

1). The forward ends of these shafts are connected by beveled gears-120 to short stud shafts 121 journaled in brackets 122. Spur gears 123 on shafts 121 are driven from ears 124 through the medium of interme iate idlers 125. The two s ur gears are connected to the inner end; of the respective drums A A so that the shafts M are driven in correspondence with the movements of the drums. At their rear ends the shafts M are provided with worms m engaging .the worm wheels 117. B Y the gearin described,the operation of eit ier drum wil rotate the corresponding cam member J and will also slowly reciprocate it back and forth in accordance with the direction in which the drum is moving. The screws K for reciprocating the cam disks J are right and left screvi s so that when both drums are coupled to the engine shaft and the operatin shafts M rotated in opposite directions, t e cam disks J themselves will be moved lon itudinally in the same direction, butwill be rotated in opposite directions.

Each cam disk J is provided on itsperiphcry with a flanged portion 126 having inclined cam teeth or ledges 127 out on its inner face. These cam ledgesare arranged to cooperate with rollers 128 mounted in inclined position upon the shifter arms H.

As above noted, the cables are wound on the drums in opposite directions so that when both are connected to the engine shaft one of the cages is raised while the other is lowered. The arrangement of the reverse ear is such that w hen either drum is rotated 1n proper direction to raise its correspondingl cage, the sleeve h will be in position to hol the shifter H at one end toward the cam mem-. ber J corresponding to the drum that is lifting its cage. The shifter H at the other end of the sleeve will be held away from its actuating cam member J and out of o erative relation therewith. The gearing etween the drums A A and the actuating cam me1nbers J is such that as either cage is raised the corresponding cam member will move inwardly towards the adjacent shifter H and at a predetermined point the cam ledges or teeth 127 thereon Wlll engage the roller 128 of the shifter H to rotate the throttle shaft g per end of the mine shaft, so that the lift of l the car is completed by the momentum of the moving parts and so that the brake mechanism (of which an be used) can be su sequently applied to promptly sto the engine and the cages or cars operate sometimes impossible to arrest' the movement of the engine by the brake when the engine is running under a full head of steam, so that ordinarily the engineer must first close the throttles before operating the brake. In the present construction, the safety mechanism automaticall closes the throttles so that the brakes may thereafter be readily applied, either 'byhand or automatically to prevent accident. In prior constructions automatic brakes have been used but if the engineer were careless or negligent the automatic valves are first automatically closed an thereafter any suitable form of automatic suitable form may thereby. It is difficult and brake mechanism may be used to arrest the movement of the engines.

When either of the shifters H have been 0 erated by the corresponding actuator J to c ose the throttles, the engineer may reverse the engine and in so doing shift the sleeve 71 to disengage the shifter H from its actuating cam member J. The engineer can then open the throttles to run the engine in reverse direction. Means are also provided for disengaging or restoring the automatic throttle mechanism When the latter is operated by either drum to close thethrottles, by disengaging the clutch mechanism of that drum.

or this purpose, each of the clutch control-.

ling shafts 88 is provided with a crank arm 129 that is connected by a link 130 to a rock arm 131 on a short vertical shaft 132 journaled in a bracket 133. A pair of arms 134 on the shaft 132 are arranged to project on opposite sides of the throttle shaft G in proper position to engage the adjacent shifter arm II. The arrangement is such that while either of the clutch levers 92 are moved to disconnect one or the other of the drums, the corresponding shifter II will be moved by the arms 134 against the tension of spring 113 to a position out of the path of movement of its actuating cam mem er J. It will thus be seen that when either drum is coupled to the engine shaft and the engine shaft is rotating in proper direction. to raise the cage connected to that drum, the automatic throttle mechanism will be in pro er position to shut off the supply of motor uid to the engines when the cage has reached a predetermined point adjacent the top of the mine shaft. By reversing the engine to lower the cage or by disconnecting its drum from the engine shaft, the engineer may throw the parts of the throttling mechanism out of cooperative re lation so that he may then open the throttles. He is however compelled to do either one or the other and cannot through carelessness or negligence run either car under a full head of steam up to the top of the mine shaft. The flange 126 on the cam member J is provided With a series of cam ledges or teeth so that it Will properly engage the roller 128 on the shifter H, even though the cam member bemoved into line with the roller when the flange 126 is opposite the same.

It is obvious that numerous changes may be made in the details of structure and arrangement of parts Without departure from the essentials of the invention.

Having described my invention, what 1 claim as new and desire to secure by Letters Patent is 1- 1. In a hoisting engine, the combination with the engine shaft, hoisting drum and clutch mechanism for connecting said drum to said shaft, of mechanism for automaticall throttling the flow of motor fluid to the en gine at a predetermined point and means controlled by the operation of said clutch mechanism for restoringsaid throttling mechanism.

2. In a hoisting engine, the combination With a plurality of hoisting drums, a common engine shaft, and separate clutch mechanisms for connecting and disconnecting each of said drums and said shaft, of mechanism for cutting off the flow of motor fluid to said engine, and means driven by each of said drums for actuating said mechanism at a predetermined point.

3. In a hoisting engine, the combination With the engine shaft, hoisting drum and clutch mechanism for coupling said drum to said shaft, of throttling mechanism for the engine, means actuated by the drum for operating said throttling mechanism at a predetermined point and means controlled by the operation of said clutch mechanism for disengaging said operating means.

4. In a hoisting engine, the combination with the engine shaft, hoisting drum and clutch mechanism for coupling said drum to said shaft, of throttling mechanism for the engine, actuating means driven by the drmn for automatically operating said throttling mechanism at a predetermined point and a clutch controlling gear arranged to restore said automatic operating means.

5. In a hoisting engine, the combination with a plurality of hoisting drums, a common engine shaft, and separate clutch mechanisms for connecting and disconnecting each of said drums and said common shaft, of throttling mechanism for the engine and separate actuating devices, one geared to and driven by each of said drums, for operating said throttling mechanism at predetermined points.

6. In a hoisting engine, the combination with the engine shaft, hoisting drum and clutch mechanism for coupling said drum to the engine shaft, of throttling mechanism for the engine, a shifter for said throttling mechanism, an actuator continuousl driven from the drum for operating said shift e at a predetermined point and means controlled by said clutch mechanism for disengaging said actuator and said shifter.

7. In a hoisting engine, the combination with the engine shaft, hoisting drum and clutch mechanism for coupling said drmn to the engine shaft, of throttling mechanism for the engine, an operating shifter for said throttling mechanism, an actuator continnously driven from the drum for operating said shifter at a predetermined point and a clutch controlling gear having means for dis engaging said shifter from said actuator.

8. In a hoisting engine, the combination with a pair of hoisting drums, at common engine shaft, and separate clutch mechanisms for connecting and disconnectingeach ofsaid drums and said common shaft. a throttle iltl liltl the flow of motor fluid to the engine at prevalve for the engine, arock shaft connected said shaft, a throttle valve for the engine, a-

rock shaft connected with the throttle valve, a shifter arm keyed on said shaft, longitudinally movable thereon and, spring-held in normal position, an actuating cam mom-her driven from the said drum arranged to engage and operate said am and rock shaft at a predetermined point and clutch con-trolling gea-r having means for moving said shifter arm out of engagement with'said actuatin cam member.

1-0. 11 ahois-ting engine, the combination with the iengine shaft, hoisting drum and clutch mechanism for coupling said drum to said shaft, a throttle valve for the engine, a rock shaft connected Withthe throttle valve, a shifter arm on said rock shaft, an actuating cam disk and means driven from said drum for rotating said disk and shifting the same laterally to engage and operate said shifter arm at a predetermined point.

I1. In a hoisting engine, the combination with the engine shaft, hoisting -drumand clutch mechanism for coupling said drum to said shaft, a throttle valve for the engine, a rock shaft connected with the throttle valve, a shifter arm-keyed on said rock shaft and springsheld to yield longitudinally thereon, a rotary actuating cam disk and means driven from said drum for rotating said diskand moving the same tow-ardsaid shifter arm to engage and operate the same at a predetermined point, said cam disk having a projecting fiange with a series of cam ledges'or teeth thereon and said shifter arm having an inclined roller on its end forengagem'en t with said cam teeth or ledges.

12. In a hoisting engine, the combination. with a pair of hoisting drums, a common-em gine shaft, and se ar'ate clutch mechanisms for connecting an disconnecting each of said drums and said common shaft, of devices operated by each of said drums for throttling determined points, and means controlle by the operation ofeach clutch mechanism for restormg the correspomling throttlingdevices.

13. In a hoisting engine, the combination with the. engine shaft, a pair of hoisting drums and clutch mechanism for connecting said iil rums to the engine shaftpof throttling mechanism for the engine and actuator mechanism driven by each of said drums for operating said throttling mechanism at prede termined points and means for operating the clutch of each drum connected to disengage the correspondingactuating mechanism.

drums, el utch' moclnimisms v drums to said'shaft, of throttling mechanism 14. In ahoisting engine, the combination with an engine shaft, two drums mounted thereon and se arate clutch mechanisms for coupling said THHIS to said shaft, of throttling mechanism for'the engine, operating shifters for said throttling mechanism, actua'tors'driven from said drums for engagin and operating said shifters at predetermined points and means controlled by the operation of either clutch mechanism for throwing the corresponding shifter and actuator out of operative rela'tion.

, 1-5. In a hoisting engine, the com-l-iination with the engine shaft, hoisting drum thereon and clutch for coupling said drum to said shaft, of throttling mechanism for the hoisting on ine, actuating means driven from the drum or operating said throttling mechanlsm at a predetermined point, an auxiliary engine for operating said clutch and control ling valve gear for said clutch engine having means for throwing said throttle actuating means out of operative position.

1 6. Ina hoisting engine, the combination with the engine shaft and hoisting drum thereon, of a throttle valve for the engine, an =0 crating rock shaft connected to said thrott e valve, a shifter arm on said rock shaft, an actuating cam member driven from said drum for-engaging and o crating said shifter arm at a pro-determiner point and reverse gear for the hoisting engine connected to disengage said shifter arm and said actuator.

17. In a hoisting engine, the combination with the engine shaft and hoisting drum thereon, of a throttle valve for the engine, an o crating rock shaft connected to said thrott e vallve, a shifter arm ke ed on said rock shaft and longitudinally shi table thereon, an

actuating cam member driven from the drum for engaging and operating said shifter arm at a predetermined point, reverse gear for the hoisting engine, an auxiliary engine for er- -ating said reverse gear and valve control in'g' mechanism for said reverse engine connected to move said shifter arm longitudinally out of operative relation with said actuating earn member.

18. In a hoisting engine, the combinat on with the engine shaft, a air of hoistin or coupling can with the engine shaft, a pair of drums mounted thereon-and clutch mechanisms fox-coupling said drums-to said shaft, of throttlmg mechanism for the engine, a pair of shifters therefor, a pair of actuating members, one

driven from each of said drums, arranged to engage and operate said shifters at predetermined points and en iw reverse gear connected to moveone 0 said actuators and its shifter out of 0 erative relation and the other actuator and shifter into operative relation.

20. ha hoisting engine, the combination with the engine shaft, a pair of drums on said shaft and clutch mechanisms for coupling said drums to said shaft, of throttlin valves for the'engine, an operating rock sha therefor, a air of shifters keyed and longitudinally s ftable on said rock shaft, a pair of actuating cam members, one driven from each of said drums arranged to engage and operate said shifters at predetermined points and engine reverse gear connected to said shifters to move one shifter out of and the other into operative relation with its actuators.

21. In a hoisting engine, the combination with the engine shaft, a pair of drums on said shaft, clutch mechanisms for connecting said drums to said shaft, of throttle valves for the engine, an operating rock shaft connected to said valves, a'pair of shifter arms on said rock shaft, a lon 'tudinally shiftable sleeve on said shaft to which said arms are connected, a pair of actuati cam members, one driven from each of sai drums for engaging and (Zperating said shifter armsat predetermine points, engine reverse gear, an auXiliary engine for said reverse gear and valve gear for said reverse engine connected to move said sleeve to throw one of said shifter arms into and the other out of operative relation with its actuator.

22. In a hoisting engine, the combination with the engine shaft, a hoistin drum, clutch mechanism for connecting sai drum to said shaft and engine reverse gear, of throttling. mechanism for the engine, actuating means driven by the drum for operating said throttling mechanism at a predetermined point and means connected to said clutch mechanism and said reverse gear for disengaging said actuating means.

23. In a hoisting engine, the combination with the engine shaft, a hoisting drum thereon and clutch mechanism for connecting said drum to the engine shaft, of throttling mechanism for the engine, an operating shifter therefor, an actuating cam memberdriven from the drum for operating said shifter, a reverse gear for the engine connected to disengage said actuator and shifter, clutch operating gear and means operated thereby for disengaging said actuator and shifter.

24. In a hoisting engine, the combination with the engine shaft, a pair of drums on said shaft and clutch mechanisms for coupling said drums to said shaft, of throttling mechanism for the engine, separate actuating mechanisms, one driven from each of said drums, for automatically perating said commas throttling mechanism at predetermined points, engine reverse gear for throwing one of said actuating mechanisms out of operation and the other into operative osition and means connected to each of sai clutch mechanisms for throwing the corresponding actuating mechanism out of operation.

25. In hoisting engines, the combination with the engine shaft, a pair of drums mounted thereon and separate clutch mechanisms for coupling said drums to said shaft, a throttling mechanism for said engine, a pair of shifters for said throttling mechanlsm, a pair of actuating cam members, one driven from each of saiddrums for operating said shifters, engine reverse gear connected to shift one of said actuators and its shifter out of operative relation and the other into operative position and means connected to each of said clutch" mechanisms for disengaging the corresponding actuator and shifter.

26. In a holsting engine, the combination with the engine shaft, a pair of hoisting drums thereon and separate clutch mechanisms for coupling said drums to said shaft, of a throttle valve for the engine, an operating rock shaft connected to said valve, a pair of shifters on said rock shaft, apair of actuating cam members, one driven from each of said drums for operating said shifters at predetermined points, engine reverse gear for moving saidshifters to throw one out of and the other into operative relation with its actuatlng cam member and a clutch controlling gear for each of said drums connected to throw the corresponding shifter out of oper- J ative relation with its actuator.

27. In a hoisting engine, the combination with the engine shaft, a pair of hoisting drums thereon and se arate clutch mechanisms for coupling sai drums to said shaft, of a throttle valve for the engine, an operating rock shaft connected to said valve, a pair of shifter arms on said rock shaft, a longitudinally movable sleeve on said shaft, to which sleeve said shifter arms are yieldingly connected, a pair of actuating cam members, one driven from each of said drums, for engaging and operating said shifter arm at predetermined points, engine reverse gear connected to said sleeve for throwing one of said shifter arms out of and the other into operative relation with its actuating cam member and controlling gear for each of said clutch mechanisms having means for throwing the corresponding shifter arm out of operative relation with its actuating cam member.

28. In a hoisting engine, the combination with the engine shaft, 8. pair of drums on said shaft and separate clutches for connecting said drums to said shaft, of throttle valves for the engine, an operating rock shaft connected to said valves, a pair of shifter arms keyed on said shaft and longitudinally movable thereon, a longitudinally shifta le sleeve on said shaft to which said shifter arms are yieldingly connected, a pair of actuating cam members, one driven from each of said drums, for engaging and operating the said shifterarms at predetermined points, reverse gear for the hoisting engine, an auxiliary engine for said. reverse gear, valve mechanism for the reverse engine connected to shift said sleeve to throw one of said, shifter arms out of operative relation and the other into operative relation'with its actuating cam members, a pair of auxiliary engines for operating said clutches and valve controlling mechanism for each of said clutch engines having means for moving the corresponding shifter arm out of operative relation with its actuating cam member.

29. In a hoisting engine, the combination with the engine shaft and hoisting drum driven thereby, of means for throttling or cutting off the flow of motor fluid to the engine, a fpair of shifters controlling the operation 0 said throttling means, actuating mechanism driven by the engine and arranged to efl'ect the operation of one or the other of said shifters at a predetermined point, andengine reverse gear connected to said shifters and arranged to move the same to throw one into and the other out of operative relation with said actuating -mechan- 1sm..

30. Ina hoisting engine, the combination with the en ineshaft and hoisting drum driven there y, of a throttle valve for the engine, a pair of shifter arms for controlling the operation of said throttle valve, actuating mechanism driven by the en inc and arranged toefiect the operation 0 one or the other. of said shifter arms at a predetermined point, and engine reverse ear connected to simultaneously move said shifter arms to throw one into and the other out of operative relation with said actuating mech-' amsm.

31. In a hoisting engine, the combination with the engine shaft and hoisting drum driven there y, of a throttle valve for the engine, a rock shaft connected to said throttle valve, a pair of shifter arms-keyed. to andslidably mounted on said rock shaft, actuating mechanism driven by the engine and arranged to engage and operate one of said shifter arms at apredetermined point, and 55 engine reverse ear connected to move said arms along sai rock shaft to throw one of said arms into and the other out of operative relation with said actuating mechanism.

32. In a hoisting engine, the combination with the en ine shaft and hoisting drum driven there y, of means for throttling or cutting off the flow of motor fluid to the engine,- a shifter controlling the operation of said" throttling means, an actuator cam geared to and rotated by'the engine, and a stationary screw for feeding said actuator cam into position to engage said shifter.

33. In a hoisting engine, the combination with the engine shaft and hoisting drum driven thereby, of a throttle valvefor the engine, a shifter arm connected to said throttle valve, a rotary actuator cam for operating said shifter arm, a shaft whereon said cam is mounted, a drive gear for said shaft driven by the engine, said shaft being longitudinally movable through said gear, and a stationary screw for feeding said shaft and cam longitudinally into posltion to engage said shifter arms.

34. In a hoisting engine, the combination '80 with the engine shaft and hoisting drum driven thereby, of a throttle valve for the engine, a controlling shifter arm for said throttle valve, a rotary actuator cam for said shifter, a shaft whereon said cam is fixed, a drive gear for rotating said shaft and cam driven by the engine, said shaft being hollow and longitudinally shiftable through said drive gear, and a stationary screw threaded within said hollow shaft for shifting said shaft and cam longitudinally into position to engage said shifter arm.

35. In a hoisting engine, the combination with the engine shaft, a pair of hoisting V drums, and separate clutch mechanisms for connecting and disconnect' said drums and shaft, of means for thrott ing or cutting off the flow of motor fluid to the engine, a pair of shifter arms controlling the operation of said throttling means, a pair of rotary actuator cams, one geared to and rotated by each of said drums, and stationary screws for shifting said actuator cams into position to engage and operate said shifter armsat predetermined points.

'36. In a hoisting engine, the combination with the engine shaft, a pair of hoisting drums and separate clutch mechanisms for connecting and disconnecting said drums and said shaft, of means for cutting off or throttling the flow of motor fluid to the engine, a pair of shifter arms controllmg the operation of said throttling means, a pair of rotary actuator cams for said shifter arms, one geared to and rotated by each of sa d drums, stationary screws for shifting said actuator cams into position to engage and operate said shifter arms,=engine reverse gear connected tosaid shifter arms to throw one into and the other out of operative 'rela- I tion with said actuator cams and means controlled by the operation of each of said clutch mechanisms for throwing the 00116.

spondin shifter am out of operative relation wit its actuator cam.

SVEN T. NELSON.

Witnesses: LILLIAN PRENTIOE i KATHARINE GERLAOH. 

